Oil smells like gas

Yesterday I did my 30k oil, and diff fluid change. while changing the oil I noticed my oil smelled like gasoline. I'm not sure what to think of this. I did a few google searches, but was looking for some advise on how to proceed.

 

Humm...I don't know what to say but like to know why as well.

 

How many miles on your oil change?

 

Do you get your truck up to operating temperature regularly?

 

Some fuel is bound to make its way into your oil no matter what. Even modern pistons don't form perfect seals, so blowby is a thing, hence the existence of PCV.

Too much fuel in the oil could be a number of things: lots of short trips (Toyota defines that as <5 miles in the owner's manual), excessive idling, or even just a symptom of using E85 in your flex fuel engine (not sure if you have a flex fuel model). These can be solved by either changing your driving habits, or changing your oil more often.

Also, aren't piston ring issues a thing for the 5.7s? I can't remember if I'm simply mixing up all of my F150 forum readings with the Tundra forum, where I thought Toyota 5.7s occasionally had oil consumption/bad piston rings.

So worst case scenario you could be looking at a clogged PCV or be one of the (un)lucky few to have piston ring problems with this truck. But I would first consider the driving habits and oil change intervals.

 

Did you get a excessive amount of oil out of crankcase?

 

Like Becauseracecar said, short trips will cause this. A little bit of fuel will get past the rings, especially when they are cold and while the engine is getting a rich mixture for starting. That doesn't indicate worn rings unless you are consuming oil. Once the engine warms up enough and stays warm for a while the fuel that got into the oil will evaporate and get drawn through the PCV valve.

 

5000 miles on this one

I drive 5.5 miles everyday to work one way (so maybe that could be it?) I also drive less than 1 or 2 miles almost every day at lunch.. I do have a flex fuel motor. 5000 mile oil change intervals using mobil1 0w20. My truck is 2018 with almost 3100 miles.

 

Short trips.

I moved oci back to 3500-4000 miles for this reason.

 

Thanks, seems easy enough I can do that

 

I change mine at 5000 and it never has smelled like that, 2014 and 2020 Tundras. I once went to 7500 and it did have the gas smell. I drive a mixture of city and highway with a fair amount of hills, approx 30-40 miles per day. As others have stated, it must be the short trips.

 

The only way to know if you have a problem is to send a used oil sample to blackstone labs or a place like it. It's the best $30 you will spend in a long time.

I found a wiped head gasket in the wife's civic before the coolant went down a noticeable amount.